D Murphy wrote:
>
> BottleBob
earthlink.net> wrote in
> news:45999F8F.9014B14F@earthlink.net:
> >>> Yes and no, the terms work offset and fixture offset in general refer
>>> to the same thing. The work coordinate system is something different
>>> entirely.
>>
>> Dan:
>>
>> The "work coordinate system" seems to be a term used differently
>> in a lathe vs. a mill.
>
> Bob,
>
> Not really. What I was getting at is that the work coordinate system is
> just that. It is the coordinate system that you set up inrelation to the
> work that you are doing. It can be set by G92 (or G50) it can also be
> changed or shifted by using G54-G59. Or you can do nothing at all, in
> which case you would be working in the machine's coordinate system.
Dan:
I interpret it from a slightly different perspective. In my view, the
work coordinate system is SET by what is put in the G54-G59 offsets. It
can be SHIFTED by a G92, G10, G52, or whatever specific G-code your
control supports.
>
> The work coordinate system is different than "fixture offsets" since it
> is possible to set one up without using G54-G59.
I still think that would be a coordinate system shift FROM the set
fixture offset (work coordinate system), to a LOCAL coordinate
system.
>
> On a lathe "work shift" is substantially the same as "fixture offsets" on
> a mill. Same G-codes. The operator panel display is different, as the
> needs are different. A person who only works on lathes would have a hard
> time relating to fixtures, so "work shift" makes more sense terminology
> wise.
>
> On the lathe, you can set the work coordinate system in several ways.
> First there is a G50 given with an absolute value. For example G50 X3.0
> Z1.5 you can also set a work coordinate system using "geometry offsets".
> You can use G54-G59. And you can shift the coordinate system by using a
> G50 along with an incremental value such as; G50 U-2.0 W-1.5.
>
> You can use them alone or in combination to set up the work coordinate
> system.
>
> --
>
> Dan
>
> CNC Videos - <
http://tinyurl.com/yzdt6d>
